Increasing storage pool while decreasing number of drives?

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Increasing storage pool while decreasing number of drives?

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0
NAS
ds920+
Operating system
  1. macOS
Hi everyone. Sorry if this has already been covered -- It seems like it would be a common use case but my searches aren't hitting it. In short this is the question of whether I can transition smoothly from a 4 drive RAID5 to a 3 drive RAID5 with much larger drives.

At the moment, I have ds920+ with 4 drives, each 5.5TB available (I think these are originally 8TB drives), in a RAID5. I hit 80%+ usage much faster than I anticipated, and am planning to switch to 3 18TB ironwolf pros. The problem is that I'm having a heck of a time figuring out how I'm going do this migration -- I don't have enough USB drives to temporarily hold all my storage. I was hoping I could do this one drive at a time, but I'm unsure if this is feasible. What happens when I replace one at a time, and wind up with 18TB / 18TB / 18TB / 8TB? Will I just be able to tell it to rebuild the pool as a 3 drive RAID5 using the increased storage on the 3 larger drives, and then permanently remove the small 8TB? I saw some old discussion about how this was not possible with RAID5, but chatGPT seems adamant it's possible with Synology NASes.
 
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Will I just be able to tell it to rebuild the pool as a 3 drive RAID5 using the increased storage on the 3 larger drives, and then permanently remove the small 8TB?
You cannot reduce the number of drives in a pool.
chatGPT seems adamant it's possible with Synology NASes.
🤣 There ya go... ask "chatty" for a link to that procedure.

BTW... ChatGPT is worse that Google's "I'm feeling lucky".
I don't have enough USB drives to temporarily hold all my storage.
So... you have no backup for your stuff 😱
I've got about 13.5TB of used space on that current storage pool I'd have to migrate. So any single future 18TB drive could in theory hold the entirety of my current pool.
 
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Will I just be able to tell it to rebuild the pool as a 3 drive RAID5 using the increased storage on the 3 larger drives, and then permanently remove the small 8TB?
You cannot reduce the number of drives in a pool.
chatGPT seems adamant it's possible with Synology NASes.
🤣 There ya go... ask "chatty" for a link to that procedure.

BTW... ChatGPT is worse that Google's "I'm feeling lucky".
I don't have enough USB drives to temporarily hold all my storage.
So... you have no backup for your stuff 😱
 
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